Bring the power of AutoLive to all your favorite optics! The AutoLive Battery Cap is compatible with Primary Arms’ SLX LPVOs and many of the industry’s most popular optics like Strike Eagle, Tango 6, and many more (a complete list will be published soon) allowing you to improve their performance with motion-sensing illumination control. If your current optic has short battery life, or if you want ‘always-on’ storage for home defense, the AutoLive Battery Cap is the perfect upgrade for you.